How often does the XVM server update player statistics?

User of XVM is placed in a queue for updating at least once every 3 days. All other players – at least once every 11 days.

I.e. when the user of XVM enters the battle, our server will check when his stats was updated. If since the last update has been more than 3 days, this user will placed in the queue for update.
All other players who got into a battle with user of XVM will placed in queue for updating if their statistics is older than 11 or more days.

Update speed of queue depends on the load on stats server and on server of WG API. It can range from a few seconds to several days.